import java.util.Stack;

class MinStack {
    private Stack<Integer> stack;
    private Stack<Integer> minStack;
    public MinStack() {
        stack=new Stack<>();
        minStack=new Stack<>();
    }

    public void push(int val) {
        stack.push(val);
        if(minStack.empty()){
            minStack.push(val);
        }else{
            if(val<=minStack.peek()){
                minStack.push(val);
            }
        }
    }

    public void pop() {
        int x1=stack.pop();
        int x2=minStack.peek();
        if(x1==x2){
            minStack.pop();
        }
    }

    public int top() {
        return stack.peek();
    }

    public int getMin() {
        return minStack.peek();
    }
}